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This article will explain in detail the example analysis of the double underscore before the name in python. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The double underscore before the name (for example: _ _ shahriar)

The use of a name (specifically a method name) preceded by a double underscore is not a convention, but has a specific meaning for the interpreter. This usage in Python is used to avoid name conflicts with subclass definitions. The Python documentation indicates that any identifier in the form of spam (at least two leading underscores and at most one subsequent underscore) will be expected, "_ internal_use" has not changed, while "method_name" has been changed to "_ ClassName__method_name". At this point, if you create a subclass B of A, you will not be able to easily override the method "_ _ method_name" in A. The spam form is replaced by the original text, where classname is the current class name that removes the leading underscore. For example, the following example:

Class A (object):... Def _ internal_use (self):... Pass... Def _ _ method_name (self):... Pass... > dir (A ()) ['_ averaged methodological name,...,'_ internal_use']

As expected, "_ internal_use" has not changed, while "method_name" has been changed to "_ ClassNamemethod_name". At this point, if you create a subclass B of A, you will not be able to easily override the method "_ _ method_name" in A.

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